usr/src/lib/libwrap/fromhost.c

   1 /*
   2  * Copyright 2001 Sun Microsystems, Inc.  All rights reserved.
   3  * Use is subject to license terms.
   4  */
   5
   6  /*
   7   * On socket-only systems, fromhost() is nothing but an alias for the
   8   * socket-specific sock_host() function.
   9   *
  10   * On systems with sockets and TLI, fromhost() determines the type of API
  11   * (sockets, TLI), then invokes the appropriate API-specific routines.
  12   *
  13   * Diagnostics are reported through syslog(3).
  14   *
  15   * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands.
  16   */
  17
  18 #ifndef lint
  19 static char sccsid[] = "@(#) fromhost.c 1.17 94/12/28 17:42:23";
  20 #endif
  21
  22 #if defined(TLI) || defined(PTX) || defined(TLI_SEQUENT)
  23
  24 /* System libraries. */
  25
  26 #include <sys/types.h>
  27 #include <sys/tiuser.h>
  28 #include <stropts.h>
  29
  30 /* Local stuff. */
  31
  32 #include "tcpd.h"
  33
  34 /* fromhost - find out what network API we should use */
  35
  36 void    fromhost(request)
  37 struct request_info *request;
  38 {
  39
  40     /*
  41      * On systems with streams support the IP network protocol family may be
  42      * accessible via more than one programming interface: Berkeley sockets
  43      * and the Transport Level Interface (TLI).
  44      *
  45      * Thus, we must first find out what programming interface to use: sockets
  46      * or TLI. On some systems, sockets are not part of the streams system,
  47      * so if request->fd is not a stream we simply assume sockets.
  48      */
  49
  50     if (ioctl(request->fd, I_FIND, "timod") > 0) {
  51         tli_host(request);
  52     } else {
  53         sock_host(request);
  54     }
  55 }
  56
  57 #endif /* TLI || PTX || TLI_SEQUENT */